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What exact specs do you have? It might be because it's the 256 GB version. afaik, those versions have much slower memory bandwidth than the 512 GB models

My friend tried it on an M4 MacBook Pro and got 25–27 tok/s

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This is correct, the 256gb is substantially slower as uses fewer physical memory chips - less ability to read/write in parallel. The 512gb or larger models have substantially higher read/write rates, and typically performs 50-100 percent faster in benchmarks than the 256.

Was a primary factor in me buying a 512gb M4 Mac Mini, even though I planned to use large external SSD - I wanted faster spec boot volume.

Yeah, its the 256gb version.

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